gtkmm: New API in gtkmm 2.4

gtkmm 4.2.0

New API in gtkmm 2.4

Member Gtk::ColorButton::ColorButton ()
Member Gtk::ComboBox::set_model (const Glib::RefPtr< TreeModel >& model)
Member Gtk::EntryCompletion::set_model (const Glib::RefPtr< TreeModel >& model)
Member Gtk::Expander::Expander ()
Member Gtk::Expander::Expander (const Glib::ustring& label, bool mnemonic=false)
Member Gtk::FileChooserWidget::FileChooserWidget (Action action)
Member Gtk::Widget::add_mnemonic_label (Widget& label)